package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Demo7 {
    public static void main(String[] args) {
        try (Connection connection = DBUtil.getConnection()){
            Statement statement = connection.createStatement();
            String sql = "SELECT COUNT(*) count,AVG(salary) avg_sal " +
                    "FROM teacher ";
            ResultSet rs = statement.executeQuery(sql);
            while (rs.next()){
                int count = rs.getInt("count");
                double avgSal = rs.getDouble("avg_sal");
                System.out.println("一共:"+count+"人,平均工资为:"+avgSal);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }
}
